libxev

As said by @laserbeam there is no implementation of concurrency built-in Zig language, just primitives. There is one event loop in the stdlib, but it has some limitations and there is some discussion to change it or remove it https://github.com/ziglang/zig/issues/8224 Some Zig libraries implementing an event loop: - libxev by Mitchell Hashimoto https://github.com/mitchellh/libxev - one from the Tigerbeetle DB https://github.com/tigerbeetledb/tigerbeetle/tree/main/src/i... They both use kernel concurrency features (io_uring/epool on Linux, kqueue on MacOS). They are quite low level and do not implement a lightweight threading model comparable to Go concurrency.